Cold water plastic paint for textured wall decoration



Patented Apr. 10, 1934 UNITED STATES PATENT OFFICE COLD WATER PLASTICPAINT FOR TEX- TURED WALL DECORATION Ontario, Canada No Drawing.Application December 26, 1930, Serial No. 504,997

3 Claims.

This invention relates to a composition of matter, manufactured and soldin dry powder form and adapted to be mixed with cold water to provide aplastic paint for textured wall decoration.

The object of the invention is to provide an accurately and uniformlycompounded composition of matter, which may be packed and stored in drypowder form without loss or deterioration and which requires only theaddition of cold water to provide a plastic paint which may be readilyapplied to wall, ceiling or other surfaces with a brush and bemanipulated with a brush, sponge, trowel, cloth or other device to giveany desired textured effect on such surface.

A further object is to provide a plastic paint of the characterindicated, which will require a minimum amount of skill on the part ofthe decorator and which will have such a constant uniformity ofcharacter, despite the usual variations of time and conditionssurrounding the use of such materials, as will enable even unskilledoperators to readily apply the same and secure any desired variations inthe pattern of the surface decorated.

More specific objects are to provide a composition of matter, thesetting or crystallization of which will be delayed to permit sufiicienttime, after the addition of water, to permit application to the wallsurface and manipulation thereon to secure the desired smooth or roughtextured effects; which, when mixed with water, will have a smooth bodywith sufficient plasticity and adhesiveness to permit the formation ofpoints, ridges and the like under manipulation of the working device,such points, ridges and the like retaining their form during the settingor hardening period, and which will be stable and. will not crack orpeel off the wall surface.

The so-called water paints of the calsomine type are well known and havebeen long used for the ordinary tinting of walls. One such tintingmaterial of this type contains the following ingredients in somewhat thefollowing proportions: whiting, 1000 lbs.; clay, 520 lbs; glue, 60

1 lbs., and gypsum, 80 lbs. The present invention may be regarded as animprovement of such tinting material, adapting the latter forapplication in thicker coats of such consistency as to permit working inthe desired manner on the wall or ceiling surface to be decorated.

For convenience of description the above defined composition of matterin approximately the proportions given will be generally referred to astinting material, and the term will be so interpreted when used in thisspecification and the appended claims.

In accordance with this invention there is mixed with this tintingmaterial plaster of Paris, which upon hydration provides a cementitiousbond for the mass, oil cake, which among other things gives the mass asmoothly flowing body, when water is mixed with it, and holds the waterin place for uniform hydration of the plaster of Earis, mica, whichassists the mass to stand out in points or ridges under manipulation ofthe working tool, a retarder, such as fruit sugar, to regulate the timeof setting of the mass and a material such as zinc sulphate to act as apreservative for the glue and prevent efflorescence 79 or the like. i

The new composition of matter or plastic paint may be prepared asfollows, the preferred proportions of the various ingredients beinggiven by way of example.

About 60 lbs. of glue is mixed with approxi-- mately 125 lbs. of waterand 2 lbs. of a preservative, such as zinc sulphate, alum or the like,preferably zinc sulphate, and allowed to stand for several hours. Inpreparing the tinting maso teria 1000 lbs, of whiting, free from strongal-.- kali reaction, is charged into a kettle or retort heated tosubstantially F. and 520 lbs. of china clay and 60 lbs. of the preparedglue is gradually added to the whiting and clay in the 35 hot kettlewhere the mixture is heated for substantially two hours. Substantially80 lbs. of gypsum is then added and the mixture heated to 215 to 230 F.for a limited period of time, leaving approximately 4% moisture in themass. To approximately 184 lbs. of this mixture of prepared tintingmaterial is then added approximately lbs. of plaster of Paris, 4 lbs. ofretarder, preferably fruit sugar, although other known retarders areavailable, 4 lbs. of oil cake 5 and 36 lbs. of mica, and the whole isintimately mixed. and ground to such a fineness that substantially 90%will pass through a 150 mesh screen. The fineness of the material mayvary within substantial limits.

The material is then ready for packaging and shipment in the form of adry powder, requiring only the addition of cold water to make it readyfor application to wall or ceiling surfaces.

While specific proportions of the various ingredients have been given,substantial variation is permissible in the tinting material base andthe other materials may be varied with the characteristics desired inthe finished material. For general purposes the specific proportionsgiven l indicate the preferred composition of the material.

The oil cake holds the water in the mass permitting the completehydration and crystallization of the plaster of Paris, thus insuringmaximum strength from the cementitious bond provided by the plaster ofParis as it crystallizes in place on the wall surface. It also increasesthe plasticity and adhesiveness of the mass, which upon applicationshould contain sufiicient water to permit the mass to drop from the faceof the mixing paddle when the face of the paddle is turned to a verticalposition. It causes the mixture to flow easily under the brush and withthe retarder, to delay the setting of the plaster of Paris, permitssufficient time to enable the operator to work the material into anydesired design, with swirls, waves, pebbles, plateaus, valleys, etc. Themica also assists in producing a finished product which will stand up inthe desired form and which will not crack or check. Moreover it seems toaffect the hardness of the material and when used in substantially theproportion specified gives best results.

To prepare the finished powder material for application to wall orceiling surfaces, it is necessary only to mix it with cold water and itis then ready for immediate application. Owing to the composition of thematerial, the water is not materially removed therefrom, as is sofrequently the case with this type of material, by the suction of thewall surface and evaporation into the atmosphere. Sufiicient water isthus always available for adequate hydration, permitting the mait maythus be used for redecorating old surfaces as well as new ones.

Moreover the dry material may be mixed with raw or boiled linseed oil orthe like to provide a plastic oil paint, but it is preferable to firstadd to the dry material sufficient water to insure the hydration of theplaster of Paris and the consequent crystallization thereof, and thenadd the oil.

We claim:

1. A composition for wall finish adapted to be rendered plastic by theaddition of cold water, comprising approximately one hundred andeighty-four pounds of whiting, clay, glue and gypsum combined, and thefollowing ingredients in approximately the proportions mentioned,plaster of Paris, one hundred pounds, oil cake, four pounds, fruitsugar, four pounds, and mica, thirty-six and one-half pounds, all finelyground and blended together.

2. A composition for wall finish adapted to be rendered plastic by theaddition of cold water, comprising whiting, clay, gypsum, glue to whichzinc sulphate has been added, plaster of Paris, oil cake, fruit sugarand mica, all finely ground and blended together.

3. A process of preparing a dry composition to be mixed with cold waterfor use as a plastic paint, comprising soaking an animal glue with watercontaining a preservative, mixing whiting and china clay in a heatedretort, gradually adding the soaked glue thereto and heating themixture, adding gypsum thereto and further heating the mixture to 215 to230 F., then intimately mixing and grinding therewith plaster of Paris,a retarder, oil cake and mica.

HERBERT JOHN HAIRE. JOHN DUNTON REYNOLDS.

